Information for An Interrogation at Hampstead Theatre, Inner London (Play). Joanna Nelson has been missing for 68 hours, and with every second that passes, D.C Ruth Palmer's hope of finding her dwindles. The young detective sits down to interview someone who looks like the least likely person to be linked to this investigation. He's a devoted son, a successful businessman and a respectable member of society. But as the minutes slip away, the detective starts to suspect that all is not what it seems... Downstairs